Chlamydophila psittaci is a lethal intracellular bacterial species that causes endemic avian chlamydiosis, epizootic outbreaks in mammals, and respiratory psittacosis in humans. It can be transmitted through inhalation, contact, or ingestions among birds and mammals. It generally starts with flu-like symptoms and becomes a life-threatening pneumonia. Many stay dormant until activated by stress. Birds are great vectors of the disease since they are highly mobile and feed on infected animals....

A pivoted catch designed to fall into a notch on a ratchet wheel so as to allow movement in only one direction (e.g. on a windlass or in a clock mechanism), or alternatively to move the wheel in one direction.